用.NET PrintDocument动态纸高

Question

我遇到了在热打印机上调整页面大小的问题。我从这个答案开始：https://stackoverflow.com/a/27165167/1030464，现在我有了粘贴在下面的代码。

这是很好的工作，尽管我计算和设置页面的大小，它似乎打印一个完整的A4大小的页面每次。(我正在Sam4s Ellix和Microsoft打印机上进行测试)--这是一个大问题，因为它需要经常打印5-6行长文本片段。

我需要支持多种热打印机，我只需要基本的功能(所以不需要接收信号，如卡纸，等等)。因此，我决定使用Windows打印机驱动程序，而不是.NET one的POS。

我计算了文本的高度和纸张的大小，但是它对输出纸的大小没有影响。有谁能解决这个问题吗？

非常感谢

public int Print(DatabaseConnector dc)
{
    try {

        // Set up PrintDocument
        PrintDocument recordDoc = new PrintDocument();
        recordDoc.DocumentName = "PrintTask ID "+id.ToString();
        recordDoc.PrintPage += new PrintPageEventHandler(PrintTask.PrintReceiptPage); // Filling in the stuff

        // Print Controller
        StandardPrintController spc = new StandardPrintController();
        recordDoc.PrintController = spc; // This hides popup

        // Printer Settings
        PrinterSettings ps = new PrinterSettings();
        ps.PrinterName = dc.ReadSetting("PrinterName"); 
        recordDoc.PrinterSettings = ps;
        recordDoc.Print();

        // Clean up
        recordDoc.Dispose();
    }
    catch (Exception exc)
    {
        ((MainForm)Application.OpenForms[0]).msg(exc.Message);
    }
    return 1; // ignore this 
}

private static void PrintReceiptPage(object sender, PrintPageEventArgs e)
{
    try {
        // Read settings
        DatabaseConnector db = new DatabaseConnector();
        PrintTask pt = db.ReadTask();
        float x = float.Parse(db.ReadSetting("PaperMarginFromLeft"));
        float y = float.Parse(db.ReadSetting("PaperMarginFromTop"));
        float width = float.Parse(db.ReadSetting("PaperWidth"));
        float height = 0F;
        string text;

        // Set up font
        Font drawFont1 = new Font(db.ReadSetting("PrintFont"), Int32.Parse(db.ReadSetting("PrintFontSize")), FontStyle.Regular);
        SolidBrush drawBrush = new SolidBrush(Color.Black);

        // Set format of string.
        StringFormat drawFormatLeft = new StringFormat();
        drawFormatLeft.Alignment = StringAlignment.Near;

        // Draw string to screen.
        text = pt.getData();
        e.Graphics.DrawString(text, drawFont1, drawBrush, new RectangleF(x, y, width, height), drawFormatLeft);

        // calculate text size
        SizeF textSize = e.Graphics.MeasureString(text, drawFont1);
        y += textSize.Height;

        // Set page size - has no effect
        e.HasMorePages = false;
        float inchHeight = PrintTask.PixelsToInchY(y, e.Graphics);
        PaperSize originalPaperSize  = e.PageSettings.PaperSize;
        PaperSize scaledSize = new PaperSize("Custom", originalPaperSize.Width, (int)Math.Ceiling(inchHeight * 100));
        e.PageSettings.PaperSize = scaledSize;
        e.PageSettings.PrinterSettings.DefaultPageSettings.PaperSize = scaledSize;

    }
    catch (Exception exc)
    {
        ((MainForm)Application.OpenForms[0]).msg(exc.Message);
    }
}

public static float PixelsToInchX(float n, Graphics graphics)
{
    return n * graphics.DpiX / 300;
}
public static float PixelsToInchY(float n, Graphics graphics)
{
    return n * graphics.DpiY / 300;
}

Answer 1

当打印到POS打印机时，不必计算高度，因为驱动程序处理纸张高度，并在文档末尾切割。转到POS打印机设置并选择“收据”作为纸张大小。通常也有一些设置来控制打印机切纸的方式和时间(全切，部分裁剪，只送纸，.)